谁可以告诉这是什么错误啊！（主要代码已经贴出来了） [复制链接]

啊～～～～～～～～～～～～～～～编译的时候出现下面的错误提示，完全不知是什么回事！

BasicWindow.o: In function `BasicWindow::createTab()':
BasicWindow.cpp:(.text+0xc0e): undefined reference to `Index_TreeModel::Index_TreeModel(QStringList const&, QString const&, QObject*)'
collect2: ld 返回 1
make: *** [ietm2] 错误 1

我是有定义的，那是个构造函数而已啊，完全不知道问题是出在哪里啊！！找死人啊！

//主题文件
[.......]
#include "Index_treemodel.h"
[.......]
     DBControl *db = new DBControl();
    tabIndex = new QWidget();
    IndexGridLayout = new QGridLayout(tabIndex);
    IndexLineEdit = new QLineEdit(tabIndex);
    IndexGridLayout->addWidget(IndexLineEdit, 0, 0, 1, 1);
    IndexListView = new QTreeView(tabIndex);
    IndexGridLayout->addWidget(IndexListView, 1, 0, 1, 1);
    QStringList Iheaders;
     Iheaders << tr("id") << tr("nodetext");
     QString Iresult = db->IndexTree("QMYSQL","localhost","tree","root","123456","select id,nodetext from treeview order by nodetext Asc");
    Index_TreeModel *amodel = new Index_TreeModel(Iheaders,Iresult);
    IndexListView->setModel(amodel);
    IndexListView->setEditTriggers(QAbstractItemView::NoEditTriggers);
    BWtabWidget->addTab(tabIndex, QString());
     BWtabWidget->setTabText(BWtabWidget->indexOf(tabIndex), QApplication::translate("MainWindow", "\347\264\242\345\274\225", 0, QApplication::UnicodeUTF8));
[.......]


//Index_treemodel.h
#ifndef INDEX_TREEMODEL_H
#define INDEX_TREEMODEL_H

#include <QAbstractItemModel>
#include <QModelIndex>
#include <QVariant>

class Index_TreeItem;

//! [0]
class Index_TreeModel : public QAbstractItemModel
{
    Q_OBJECT

public:
    Index_TreeModel(const QStringList &headers, const QString &data,QObject *parent = 0);
    ~Index_TreeModel();
//! [0] //! [1]

    QVariant data(const QModelIndex &index, int role) const;
    QVariant headerData(int section, Qt::Orientation orientation,
                        int role = Qt::DisplayRole) const;

    QModelIndex index(int row, int column,
                      const QModelIndex &parent = QModelIndex()) const;
    QModelIndex parent(const QModelIndex &index) const;

    int rowCount(const QModelIndex &parent = QModelIndex()) const;
    int columnCount(const QModelIndex &parent = QModelIndex()) const;
//! [1]

//! [2]
    Qt::ItemFlags flags(const QModelIndex &index) const;
    bool setData(const QModelIndex &index, const QVariant &value,
                int role = Qt::EditRole);
    bool setHeaderData(int section, Qt::Orientation orientation,
                      const QVariant &value, int role = Qt::EditRole);
    bool insertRows(int position, int rows,
                    const QModelIndex &parent = QModelIndex());
    bool removeRows(int position, int rows,
                    const QModelIndex &parent = QModelIndex());

private:
    void setupModelData(const QStringList &lines, Index_TreeItem *parent);
    Index_TreeItem *getItem(const QModelIndex &index) const;

    Index_TreeItem *rootItem;
};
//! [2]

#endif


//Index_treemodel.cpp
#include <QtGui>
#include <QDebug>
#include <QtSql>

#include "Index_treeitem.h"
#include "Index_treemodel.h"

//! [0]
Index_TreeModel::Index_TreeModel(const QStringList &headers,const QString &data,QObject *parent) : QAbstractItemModel(parent)
{
    QVector<QVariant> rootData;
    foreach (QString header, headers) 
        rootData << header;

    rootItem = new Index_TreeItem(rootData); 
    setupModelData(data.split(QString("\n")), rootItem);
}
//! [0]

//! [1]
Index_TreeModel::~Index_TreeModel()
{
    delete rootItem;
}
//! [1]

//! [2]
int Index_TreeModel::columnCount(const QModelIndex &parent) const
{
    return rootItem->columnCount();
}
//! [2]

QVariant Index_TreeModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    if (role != Qt::DisplayRole && role != Qt::EditRole)
        return QVariant();

    Index_TreeItem *item = getItem(index);

    return item->data(index.column());
}

//! [3]
Qt::ItemFlags Index_TreeModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::ItemIsEnabled;

    return Qt::ItemIsEditable | Qt::ItemIsEnabled | Qt::ItemIsSelectable;
}
//! [3]

//! [4]
Index_TreeItem *Index_TreeModel::getItem(const QModelIndex &index) const
{
    if (index.isValid()) {
        Index_TreeItem *item = static_cast<Index_TreeItem*>(index.internalPointer());
        if (item) return item;
    }
    return rootItem;
}
//! [4]

QVariant Index_TreeModel::headerData(int section, Qt::Orientation orientation,
                              int role) const
{   
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
        return rootItem->data(section);

    return QVariant();
}

//! [5]
QModelIndex Index_TreeModel::index(int row, int column, const QModelIndex &parent) const
{
    if (parent.isValid() && parent.column() != 0)
        return QModelIndex();
//! [5]

//! [6]
    Index_TreeItem *parentItem = getItem(parent);

    Index_TreeItem *childItem = parentItem->child(row);
    if (childItem)
        return createIndex(row, column, childItem);
    else
        return QModelIndex();
}
//! [6]

bool Index_TreeModel::insertRows(int position, int rows, const QModelIndex &parent)
{    
    Index_TreeItem *parentItem = getItem(parent);
    bool success = false;
     QString tag;
     QString newtag;

     beginInsertRows(parent, position, position + rows - 1);

                         parentItem->insertChildren(position, rows, rootItem->columnCount());
                         success = true;
                         endInsertRows();

    return success;
}

//! [7]
QModelIndex Index_TreeModel::parent(const QModelIndex &index) const
{
    if (!index.isValid())
        return QModelIndex();

    Index_TreeItem *childItem = getItem(index);
    Index_TreeItem *parentItem = childItem->parent();

    if (parentItem == rootItem)
        return QModelIndex();

    return createIndex(parentItem->childNumber(), 0, parentItem);
}
//! [7]

bool Index_TreeModel::removeRows(int position, int rows, const QModelIndex &parent)
{
    Index_TreeItem *parentItem = getItem(parent);
    bool success = false;

           beginRemoveRows(parent, position, position + rows - 1);
             success = parentItem->removeChildren(position, rows);
             endRemoveRows();

     return success;
}

//! [8]
int Index_TreeModel::rowCount(const QModelIndex &parent) const
{
    Index_TreeItem *parentItem = getItem(parent);

    return parentItem->childCount();
}
//! [8]

bool Index_TreeModel::setData(const QModelIndex &index, const QVariant &value,
                        int role)
{
    if (role != Qt::EditRole)
        return false;

    Index_TreeItem *item = getItem(index);
             return item->setData(index.column(), value);
}

bool Index_TreeModel::setHeaderData(int section, Qt::Orientation orientation,
                              const QVariant &value, int role)
{
    if (role != Qt::EditRole || orientation != Qt::Horizontal)
        return false;

    return rootItem->setData(section, value);
}

void Index_TreeModel::setupModelData(const QStringList &lines, Index_TreeItem *parent)
{
    QList<Index_TreeItem*> parents;
    QList<int> indentations;
    parents << parent;
    indentations << 0;

    int number = 0;

    while (number < lines.count())
     {
         int position = 0;
        QString lineData = lines[number].trimmed(); 

        if (!lineData.isEmpty())
           {
            QStringList columnStrings = lineData.split("\t", QString::SkipEmptyParts);
                position = columnStrings[0].length();
            QVector<QVariant> columnData;
            for (int column = 0; column < columnStrings.count(); ++column)
                columnData << columnStrings[column];                                       

            Index_TreeItem *parent = parents.last();
            parent->insertChildren(parent->childCount(), 1, rootItem->columnCount());
            parent->child(parent->childCount() - 1)->setData(0, columnData[1]);
            parent->child(parent->childCount() - 1)->setData(1, columnData[0]);
                }

        number++;
        }
}

try to do the following:

  1. make clean
  2. make

If  it still does not work, you may have typing error. Try to copy(not typing) the function from the header file to your .cpp file. It should be an easy bug to fix.

把代码贴出来